My question is about the psion Tactician Collective class feature, we had a Ghost in our party but the undead has inmunity mind-affecting effects (charms, compulsions, morale effects, phantasms, and patterns) but the collective is a psion effect like telepathy bond and is not detail more details about this kind of effect.
The main question is: A Ghost or a inteligent undead can be part of the Collective?